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“Leicester are a good team and Porto will have to play very well to beat them.”

Mourinho also reserved praise for Leicester's record signing, Islam Slimani, who he believes adds another dimension to Ranieri's side.

“Slimani, who seemed to be out of context in the team against Manchester, came to add what they didn’t have, which is the aerial ball power, jumping to deflect and Vardy running in deep, attacking the crosses they make from the wings.”

But the United manager made no secret of who he was supporting when the two meet on Tuesday evening.

“I like Claudio Ranieri, I have great respect for Leicester, but I’m more of a Portista."